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                Poi2013 Bytecomputer                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div></div>
<div><span style="font-size: medium">A sequence of N &nbsp;integers I1,I2&hellip;In from the set {-1,0,1} is given. The bytecomputer is a device that allows the following operation on the sequence: incrementing I(i+1) by I(i) for any 1&lt;=I&lt;=N. There is no limit on the range of integers the bytecomputer can store, i.e., each I(i) can (in principle) have arbitrarily small or large value.</span></div>
<div><span style="font-size: medium">Program the bytecomputer so that it transforms the input sequence into a non-decreasing sequence (i.e., such that I1&lt;=I2&lt;=&hellip;I(n)) with the minimum number of operations.</span></div>
<div><span style="font-size: medium">给定一个{-1,0,1}组成的序列,你可以进行x[i]=x[i]+x[i-1]这样的操作,求最少操作次数使其变成不降序列。</span></div>
<div></div>
<p></p></p><hr/><h3>输入格式</h3><p><div><span style="font-size: medium">The first line of the standard input holds a single integer N(1&lt;=N&lt;=1000000) , the number of elements in the (bytecomputer's) input sequence.</span></div>
<div><span style="font-size: medium">The second line contains N &nbsp;integers I1,I2&hellip;I(n) Ii from set {-1,0,1} &nbsp;that are the successive elements of the (bytecomputer's) input sequence, separated by single spaces.</span></div>
<div></div>
<p></p></p><hr/><h3>输出格式</h3><p><div></div>
<div>
<div><span style="font-size: medium">The first and only line of the standard output should give one integer, the minimum number of operations the bytecomputer has to perform to make its input sequence non-decreasing, of the single word BRAK (Polish for none) if obtaining such a sequence is impossible.</span></div>
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<p></p>
</div></p><hr/><h3>样例输入</h3><pre>6
-1 1 0 -1 0 1
</pre><hr/><h3>样例输出</h3><pre>3
Explanation of the example: with three operations, the bytecomputer can obtain the sequence  -1,-1,-1,-1,0,1
</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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